For the first time in the country's history, paleontologists in Mexico have discovered a fully articulated dinosaur tail – and it's a doozy. Believed to have belonged to a hadrosaur living 72-million years ago, the tail's 50 intact vertebrae extend a whopping 16-feet in length, and are in pristine condition. »7/23/13 11:20am 7/23/13 11:20am